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• W2605042492 abstract "The mechanisms that trigger retinal degeneration are not well understood, despite the availability of several animal models with different mutations. In the present report, the rd10 mouse, a model for retinitis pigmentosa (RP) that contains a mutation in the gene for PDE6β (Pde6b), is used to evaluate gliosis, as a marker for retinal stress, and cyclic AMP response element binding protein (CREB) phosphorylation, which may be important early in retinal degeneration.Wild-type C57Bl6J and rd10 mice raised under cyclic light were examined for changes in gliosis and CREB phosphorylation for approximately 3 weeks beginning at P14 to P17 using immunocytochemistry. Mice raised under normal cyclic light and in complete darkness were also compared for changes in CREB phosphorylation.Gliosis in rd10 mice raised under cyclic light was apparent at P17, before extensive degeneration of the photoreceptor layer is visible, and increased over time. Phosphorylation of CREB at Ser133 (pCREB) was detected in Müller glia (MG) in the wild-type and rd10 mice. However, at all phases of photoreceptor degeneration, the pCREB levels were lower in the rd10 mice. We also observed extensive migration of MG cell bodies to the outer nuclear layer (ONL) during degeneration. In contrast to the mice raised under cyclic light, the rd10 mice raised in the dark exhibited slower rates of degeneration. When the dark-reared mice were exposed to cyclic light, the photoreceptor layer degenerated within 4 days to approximately one to two rows of nuclei. Interestingly, the pCREB levels in the MG also decreased during this 4-day cyclic light exposure compared to the levels in the rd10 mice raised continuously in the dark.The results of these studies suggest that photoreceptors communicate directly or indirectly with MG at early stages, inducing gliosis before extensive retinal degeneration is apparent in rd10 mice. Surprisingly, phosphorylation of CREB is downregulated in the MG. These results raise the interesting possibility that Müller glia undergo CREB-mediated transcriptional changes that influence photoreceptor degeneration either positively or negatively. Unlike canine models of RP, no increase in pCREB was observed in photoreceptor cells during this period suggesting possible mechanistic differences in the role of CREB in photoreceptors between these species." @default.
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• W2605042492 date "2017-01-01" @default.
• W2605042492 modified "2023-10-05" @default.
• W2605042492 title "Reduced phosphoCREB in Müller glia during retinal degeneration in rd10 mice." @default.
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